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path.go
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73 lines (66 loc) · 1.75 KB
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/*
* Copyright 2018 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package utils
import (
"io"
"os"
"os/user"
"path/filepath"
"strings"
)
// CopyFile copies from src to dst until either EOF is reached
// on src or an error occurs. It verifies src exists and removes
// the dst if it exists.
func CopyFile(src, dst string) (int64, error) {
cleanSrc := filepath.Clean(src)
cleanDst := filepath.Clean(dst)
if cleanSrc == cleanDst {
return 0, nil
}
sf, err := os.Open(cleanSrc)
if err != nil {
return 0, err
}
defer sf.Close()
if err := os.Remove(cleanDst); err != nil && !os.IsNotExist(err) {
return 0, err
}
df, err := os.Create(cleanDst)
if err != nil {
return 0, err
}
defer df.Close()
return io.Copy(df, sf)
}
// HomeDirExpand tries to expand the tilde (~) in the front of a path
// to a fullpath directory.
func HomeDirExpand(path string) string {
usr, err := user.Current()
if err != nil {
return path
}
if path == "~" {
return usr.HomeDir
} else if strings.HasPrefix(path, "~/") {
return filepath.Join(usr.HomeDir, strings.TrimPrefix(path, "~/"))
}
return path
}
// Exist return if file or path is exist.
func Exist(path string) bool {
_, err := os.Stat(path)
return err == nil || os.IsExist(err)
}